LAUSR

Abstract Cobalt and zinc bi-metal organic frameworks (CoZn-MOF) derived from double metal hydroxides (CoZn-DMH) is synthesized on the surface of rice husk carbon via hydrothermal method. The obtained CoZn-MOF/RHC is then be used as electrochemical sensor for dopamine detection. SEM and TEM characterization displays that the morphology of CoZn-MOF/RHC is different from CoZn-DMH, as well as the electrochemical performance. Further investigation reveals that the kinetic process of the redox reaction of dopamine on CoZn-MOF/RHC electrode is controlled by diffusion process. Under the optimum conditions, the redox peak current linearly relates with the concentration of dopamine in the range of 2 μM∼0.8 mM, with the low detection limit of 0.67 μM. During the anti-interference experiment, CoZn-MOF/RHC exhibits good selectivity toward dopamine detection but inappreciable response for interferent.